16" 



13 



GEOLOdlC MAP 



NORTH AMERICA 



COMPILED BY THE 



UNITED STATES GEOLOGICAL SURVEY 



IN COOPEKATION M^TH THE 



GEOLOGICAL SURVEY OF CANADA 



AND 



INSTITUTO GEOLOGICO DE MEXICO 



Under the supervision of Bailey Wilis 

 and George W. Stose 



14° 



12° 



10" 



SCALE. 1:5.000,000 

 19U 



16° 



114° 



112° 



HO 



108° 



106° 



104° 



102° 



100° 



